原来如此简单：解决Mac上的Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

mac os上第一次使用mysql,果然出现了问题，安装好mysql的dmg后，在终端输入mysql,结果出现

hrfpc:~ hrf$ mysql

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
这个错误

在网上搜到很多方法，不好使，然后查询了官方文档
http://dev.mysql.com/doc/refman/5.7/en/can-not-connect-to-server.html
下面写道

Here are some reasons the 

Can't connect to local MySQL server

 error
might occur:

mysqld is
not running on the local host. Check your operating system's process list to ensure the mysqld process
is present.

。。。

没想到第一条就符合，然后我尝试输入mysqld
结果

hrfpc:~ hrf$ mysqld

mysqld: Can't change dir to '/usr/local/mysql-5.7.16-osx10.11-x86_64/data/' (Errcode: 13 - Permission denied)
等一大串错误之类的 ，最后退出了
最后，正确的方法：

hrfpc:~ hrf$ sudo mysqld_safe

2016-10-14T11:47:17.6NZ mysqld_safe Logging to '/usr/local/mysql/data/hrfpc.err'.

2016-10-14T11:47:17.6NZ mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data

然后mysqld服务就运行啦

此时，终于能够打开mysql:

hrfpc:etc hrf$ mysql -u root -p

Enter password: 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 13

Server version: 5.7.16

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Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

有时事情总是用最简单的办法解决